Poly?

[MoparEd]

1st ?) what is a 318 Poly worth (running one).
2nd ?) Is it worth building a 318 Poly or a 383, which I have.

Reason I ask I'm getting ready to junk the 318 to the scrape yard. But I'm going to strip it. I would love to sell it ????

 

[1badstroker]

build the 383 and sell the poly.

 

[65rbdodge]

i have one that i`ve been trying to sell for $100 its complete and running with 68,000 miles on it. no one wants it, i`ve had it for quite some time. you will be better off building the 383, it will be cheaper, easier to find parts for and make more power.

 

[eastsider]

build the 383 good luck with poly i had a hard time giving one away for free

 

[65AzBel]

Build the 383.

 

[rolling_Thunder]

Build the 383 - I have a 318 Poly in my 66 Satellite but parts are hard to come by... I'm going with the 383 for simplicity and because all my spare parts are Big Block

 

[Histoy]

Before you give away or junk those Poly engines, try listing them on the '61-'65 Mopar site. Someone there may be interested.

 

[MoparEd]

thanks to everybody for thier in put

 

[markmopar]

build the 383 good luck with poly i had a hard time giving one away for free

That's funny-I'm trying to give away the that exact same engine I got from you and the guys that were gonna get it didn't show up!

 

[MoparEd]

Mark I pm U

 

[rumblefish360]

Ya gotta wanna build a poly engine. There strokable with a 4.00 LA crank and accept overbores to .090 easy. Head flow is an issue from what I know and am told.

Mopar Muscle mag had a build up in there rag doing this stroker route to 402 cubes and produced approx 1 hp per cube+.

 

[69 Runner]

I've heard, but have not verified, it's possible to bolt up certain early Hemi heads on a Poly block. THAT would probably solve the flow problem:grin:

 

[Steve1118]

Actually, the Poly head is a good design. It is the same design as the BB Chevrolet, staggered valves. On paper they have good potential.

The problem is that you cannot get parts for them.....I don't even think a set of headers is available. Not much interchanges from the LA engine series. Some of the early factory ones had two four barrell setups....they used old Carter WCFB's. I still have an old Weiand Tri Power intake with three Stromberg 97 carbs I've had laying around for forty years.

I think you might try some street rod type guys.....they seem to relish something different.

 

[69 Runner]

I've also heard there is a ford header you can use with them but you have to change the orientation of the mounting flanges.

 

[rumblefish360]

Actually, the Poly head is a good design. It is the same design as the BB Chevrolet, staggered valves. On paper they have good potential.

The problem is that you cannot get parts for them.....I don't even think a set of headers is available. Not much interchanges from the LA engine series.

I think you might try some street rod type guys.....they seem to relish something different.

The Poly head is an excellent design IMO, but, however, this particular head hasn't enuff on it to port out to extreme levels of HP. It's not bad for the dispalcement size engines it came on though.
But what gets on paper and what really happens can be two different things. Ethier way that is.

Parts;

I'm not to sure about the valves themselfs. I really do not see a problem getting a valve stems length in the length you require from aftermarket companys. Guides can be an easy thing even if the OE dimentions or part itself isn't out there. Theres allways a way.

After that, the Poly head will take LA springs and asocc. parts.

Headers; TTI is the only place I know of right now making Poly headers.

Not much interchanges from the LA engine series? Hummmm, gaskets for sure.
Oil pan I believe. UM..., well, you CAN use crank rods timing chain oil pump pick up intermediate drive gear distributor/cap/rotor/plugs/wires. The rest I'm not sure about.

Intakes; The Weiand is probablt the easiest aluminum intake 4bbl. to get. Edelbrock made one years and years ago . Both and Offenhauser did tri carb set ups and there are dual quads from a pair of aftermarket manufactures as well.
(2 - small 400 cfm Carters (WCFB or AFB's.) would be very good here, but there near impossible to find and expensive when you do find them.
Remember that the WCFB has a unique set up and will need to have the secondarys opened up from time to time in order to rid the secondary feul bowls of the fuel before it goes bad. The secondary side is seprated and the fuel sits stagnet until needed.
Rebuild kits are out there for the WCFB and super early AFB's.

Do a goggle search "POLY" and look for a guy named Gary Polvich. Though I think I spelled his last name wrong.

IF your interested in doing a poly, speak with him and also send him my best. He's into them and very good at it.

 

[69 Runner]

Make us all proud and build the poly. I've always thought it would be cool to roll in to a cruise in an early B with a thumpin poly and make people wonder what it is.

I Am accepting donations to the cause of restoring Mopar muscle. The more I have, the more I'll restore. So I'll be posting the address for you all to send your hard earned dollars to real soon....:grin:

 

[Histoy]

Gary Pavlovich is a Poly performance guru. You can contact him by going to the '62-'65 Mopar site and joining their mail clubhouse. Gary and others on that site can provide a lot of info on Poly engines.

 

[rumblefish360]

Ahhhhhhh, thanks for clearing up the spelling on his name. (LOL) And the site to get him at. They love those things over there. They'll also clear up any mistakes I might have made for sure.

Gary's a good guy.

 

[73rr]

I've heard, but have not verified, it's possible to bolt up certain early Hemi heads on a Poly block. THAT would probably solve the flow problem:grin:

NO, will not work on any A series engine.
The confusion goes back to the 'other' poly engine used in the 55 & 56 Plymouth, the 260 and 270. These are the same basic engines as was used by Dodge in both Hemi and Poly configurations. Hemi heads from a 53-57 Dodge will bolt on to the 260 and 270 Plymouth.

Need more confusion?
The 270 is not the same as the 277, and the Plymouth 301 is not the same as the Chrysler 301.

The 318P is an excellent engine, but there were major design changes for the 63 model year so do not try to interchange pre63 parts with post 62 parts.
The head design was dropped to save money not because it was inefficient. Plenty of parts available and some interchange with the LA.

 

[64maxwedge]

Actually, the Poly head is a good design. It is the same design as the BB Chevrolet, staggered valves. On paper they have good potential.

The problem is that you cannot get parts for them.....I don't even think a set of headers is available. Not much interchanges from the LA engine series. Some of the early factory ones had two four barrell setups....they used old Carter WCFB's. I still have an old Weiand Tri Power intake with three Stromberg 97 carbs I've had laying around for forty years.

I think you might try some street rod type guys.....they seem to relish something different.

Headers ARE available for the Poly. TTI makes them, and they fit like a glove!!!!!